1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Jobisdone [24]
3 years ago
14

Roy is twice as old as Joan, and in 3 years the sum of their ages will be 21 years. Find their present ages.

Mathematics
1 answer:
Lisa [10]3 years ago
8 0

Answer:

Roy is 10 years old at present and Joan is 5 years old at present

Step-by-step explanation:

Let

x----> Roy's age

y----> Joan's age

we know that

x=2y ----> equation A

(x+3)+(y+3)=21 ----> equation B

substitute equation A in equation B

(2y+3)+(y+3)=21

solve for y

3y+6=21

3y=21-6

3y=15

y=5 years

Find the value of x

x=2y  ----> x=2(5)=10 years

therefore

Roy is 10 years old at present

Joan is 5 years old at present

You might be interested in
Create a list of 5 potential jobs that students of meteorology can obtain.
Andrei [34K]
Researcher
Military and airline forces
Teaching
Storm chaser
Environmental scientist
5 0
3 years ago
In remodeling a house an architect finds that by adding the same amount to each dimension of a 15ft by 19ft rectangular room, th
earnstyle [38]

Answer:

Step-by-step explanation:

new length=15+x

width=19+x

then area=(15+x)×(19+x)=285+15x+19x+x²=x²+34x+285 ft²

original area=15×19=285 ft²

then 285+98=x²+34x+285

or

x²+34x-98=0

x²+34x+17²=98+17²

(x+17)²=98+289=387

x+17=√387=3√43

x=3√43-17 ft

8 0
3 years ago
In the cube shown below, the distance between vertices 2 and 6 is 15 cm.
sveta [45]
45 squared centimeters
4 0
3 years ago
Read 2 more answers
A flower shop sells daffodils in bunches of 9 daffodils. The shop sells 27 daffodils. How many bunches of daffodils did the shop
amm1812

Answer:

its 3 brother

Step-by-step explanation:

you divide 27 by 9 and thats 3

6 0
3 years ago
Find a round to the nearest tenth a 150 12 10cm c a=?cm
Kryger [21]

Answer:

<h3>Using~ the ~ law~ of ~sinse:-</h3><h3>\frac{a}{SinA} =\frac{b}{SinB}</h3>
  • \frac{a}{Sin150}=\frac{b}{SinB}
  • a=\frac{10~sin~150}{Sin~12}
  • a=[24] ~cm
<h3><u>-----------------------</u></h3><h3><u>hope it helps..</u></h3><h3><u>have a great day!!</u></h3>
7 0
3 years ago
Other questions:
  • How to find the inverse of h(x) = 3/ -x - 2 List steps.
    6·1 answer
  • What is the probability of surviving 6.5 years?
    13·1 answer
  •  Joe's water tower leaks 0.6 liters of water per day. How much water is lost over 12 dayspp​
    9·1 answer
  • Please help ASAP I’m very unsure on how to do these 2 questions please give answers for both :)
    14·2 answers
  • It takes Maya 30 minutes to solve 5 logic puzzles. At this rate, how many logic puzzles does she solve in 1 hour 30 minutes?
    13·2 answers
  • What are the solution(s) to the quadratic equation 50 - x2 = 0?
    15·1 answer
  • Solve the following equation with the initial conditions. x¨ + 4 ˙x + 53x = 15 , x(0) = 8, x˙ = −19
    13·1 answer
  • I need help please someone explain me how to do it
    8·1 answer
  • 34.
    13·2 answers
  • Marking brainless lol!!
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!